Legal claims defining the scope of protection, as filed with the USPTO.
1. A communication device configured to operate in a 3GPP LTE cellular communication system, comprising: a power amplifier; and a switch mode voltage converter of direct current-to-direct current type arranged to provide a supply voltage to the power amplifier; wherein the power amplifier is configured to operate in a linear mode during uplink transmissions with a 20 MHz bandwidth, and in a nonlinear mode during uplink transmissions with a 5 MHz bandwidth.
2. The communication device of claim 1 , wherein the linear mode is an envelope tracking mode.
3. The communication device of claim 1 , wherein the nonlinear mode is a polar modulation mode.
4. The communication device of claim 3 , wherein the switch mode voltage converter is configured to modulate the supply voltage of the power amplifier with an amplitude component of an uplink transmission, when operating in the polar modulation mode.
5. The communication device of claim 1 , further comprising a controller configured to control the operating mode of the power amplifier.
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July 24, 2018
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